No such weapon. However, there is a SS version of the 57 called the 657. Price range of 100-560 USD or so
400 or so
300-400 USD
I believe a stand barrel for the S&W model 29 is 6.5 inches. Perhaps someone changed your barrel ????
300-3000 usd
300 or so
100-425 USD
Impossible to answer without a detailed description.
0-350 usd
Five Dollars.
Value of a smith and western model 581 357 magnum crome with 6 inch bull barrel
2nd sep 1949
100-375